Wall Street loses ground on recovery worry

The Dow and the S&P 500 dropped to session lows on Tuesday, while the Nasdaq trimmed gains, as investors worried that the economic recovery's pace might not be as strong as initially hoped.

* While a rebound in May housing starts pointed to some stabilization in that sector and a smaller-than-expected rise in producer prices suggested inflation pressures were muted, another report showed industrial production logged a steeper-than-expected slide last month.

* Mixed quarterly results from Best Buy Co Inc , the largest U.S. consumer electronics retailer, also fueled some caution. The stock was off nearly 7 percent at $36.12.

A white Fiat van rammed into pedestrians outside enjoying a late afternoon stroll on Las Ramblas in Barcelona on Thursday killing at least 13 people and leaving hundreds injured. The Islamic State group claimed responsibility for the attack.